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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd313fb4df5619f903d95400ba576a28f8a490c5020dae0dd33f62bdedf79e9' 
  AND token = 'ccil8iglilA8l4LecE+POFLYo5wQf8dhU2nuw1hFNZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}